Sorry, I chose Danmei because I am [female-oriented]. Although it is a father-son relationship, strictly speaking...
Not Tanmei. No romance.
Some are... Shh.
——You see, I even wrote the names of the protagonist and supporting characters as to be determined. Because, if you say it, it is too dangerous from all angles.
The setting is similar to a fictional light novel from the Victorian era. Pseudo science fiction. An adoptive father and son and a secret that must never be revealed.
Here, time is never the enemy. The projection of the rotating time embedded in the gears is just a little trick they played during afternoon tea, which has long broken the barrier between the laws of life and death. Whether they are vampires or humans here, they have a lot of energy to do the research at hand, and they also have a lot of opportunities to explore dangerous restricted areas where normal people are likely to pay the price with their lives.
However, everyone who has a relationship with this organization has been controlled, or taken away the ability to tell the truth, or imprisoned for life in an unknown place to die alone, or actively or passively ended their lives after they collapsed and learned the truth.